Heat Loss Calculator — Your Site Title

01

Where is the room located?

Select the option that best describes the room.

Basement or ground floor A room positioned at ground level or below. Middle or top floor A room positioned above the ground floor.

02

What is the room height?

Round up to the nearest half metre. For example, enter 2.5 m for a room measuring 2.28 m.

2 m 2.5 m 3 m 3.5 m 4 m 4.5 m 5 m

03

What is the floor area?

Multiply the length of the room by its width.

Floor area

m²

04

What type of outside wall does the room have?

Select the closest match for the exterior wall construction.

Solid wall Traditional solid masonry construction. Cavity wall Two wall layers separated by a cavity. Insulated wall A wall with effective thermal insulation.

05

What is the total length of the outside walls?

Include exterior walls and walls with unheated rooms on the other side.

Total outside wall length

m

06

What type of windows does the room have?

Select the primary glazing type used in the room.

Single glazed A window using a single pane of glass. Double glazed Two panes of glass with a sealed gap.

07

What is the total area of all windows?

Multiply the height by the width of each window, then add the areas together.

Total window area

m²

Calculate the heat output required for your room